As Carry_Okie suggest, we should read the Constitution, but we should also attend to what it means. It requires the vote of 2/3 of the Senate to ratify a treaty, and thus the votes of more than 1/3 of the Senate can deny a treaty ratification. Hence, 34 (> 100/3) Senators can prevent ratification of a treaty. Yes, if our folks don’t show up for the vote and let the ‘Rats have a quorum, 2/3 of a quorum will suffice to ratify, but then 1/3 of the quorum would suffice to block — however on something of this import, I trust our side will force the ‘Rats to gather the full Senate or drop it.
(Knowing the text of the Constitution does not suffice — the Founders expected the citizenry to be moderately well educated, and that includes being able to do simple arithmetic and reason soundly about things like arithmetic and the text of the Constitution.)
No, it does not. Article II, Section 2, Clause 2 as quoted above in post 24, requires only 2/3 of Senators PRESENT for ratification. If there is but a minimum quorum of 51, that is 34.
You owe FR $1,000.